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**isFinite**- Answer whether the receiver does not represent infinity, nor a NaN
**isInfinite**- Answer whether the receiver represents positive or negative infinity
**isNaN**- Answer whether the receiver represents a NaN
**negative**- Answer whether the receiver is negative
**positive**- Answer whether the receiver is positive. Negative zero is not positive, so the definition is not simply >= 0.
**sign**- Answer 1 if the receiver is greater than 0, -1 if less than 0, else 0. Negative zero is the same as positive zero.
**strictlyPositive**- Answer whether the receiver is > 0